Data nullification device for nullifying digital content recorded on a recording medium, after the digital content has been reproduced, a predetermined time period has passed since the recording of the digital content, or the digital content has been moved to another recording medium
First Claim
1. A data nullification device for nullifying target data recorded on a recording medium, the target data being made up of a plurality of data blocks, the data nullification device comprising:
- a judging unit operable to judge, for each data block recorded on the recording medium, whether the data block needs to be nullified; and
a nullifying unit operable to nullify, when a predetermined number of data blocks are judged as needing to be nullified or when one or more data blocks whose total amount of data reaches a predetermined amount are judged as needing to be nullified, the judged data blocks.
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Accused Products
Abstract
A data nullification device for nullifying target data recorded on a recording medium is provided. The target data is made up of a plurality of data blocks. A judging unit judges, in units of data blocks, whether the target data needs to be nullified. A nullifying unit nullifies, when a predetermined number of data blocks are judged as needing to be nullified or when one or more data blocks whose total amount of data reaches a predetermined amount are judged as needing to be nullified, the judged data blocks.
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Citations
44 Claims
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1. A data nullification device for nullifying target data recorded on a recording medium, the target data being made up of a plurality of data blocks, the data nullification device comprising:
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a judging unit operable to judge, for each data block recorded on the recording medium, whether the data block needs to be nullified; and
a nullifying unit operable to nullify, when a predetermined number of data blocks are judged as needing to be nullified or when one or more data blocks whose total amount of data reaches a predetermined amount are judged as needing to be nullified, the judged data blocks. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 26, 27, 28, 29, 30, 31, 32, 33, 34, 36, 37, 38, 39, 40, 41, 42, 43, 44)
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25. A data nullification program for nullifying target data recorded on a recording medium, the target data being made up of a plurality of data blocks, the data nullification program having a computer execute the steps of:
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judging, for each data block recorded on the recording medium, whether the data block needs to be nullified; and
nullifying, when a predetermined number of data blocks are judged as needing to be nullified or when one or more data blocks whose total amount of data reaches a predetermined amount are judged as needing to be nullified, the judged data blocks.
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35. A data nullification method for nullifying target data recorded on a recording medium, the target data being made up of a plurality of data blocks, the data nullification method comprising the steps of:
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judging, for each data block recorded on the recording medium, whether the data block needs to be nullified; and
nullifying, when a predetermined number of data blocks are judged as needing to be nullified or when one or more data blocks whose total amount of data reaches a predetermined amount are judged as needing to be nullified, the judged data blocks.
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Specification